Methanesulfonic Acid → Garenoxacin mesylate

Participants

Reaction Conditions

Reaction Steps

In 4 ml of ethanol is suspended 0.2 g of (R)-1-cyclopropyl-8-difluoromethoxy-7-(1-methyl-2,3-dihydro-1H-5-isoindolyl)-4-oxo-1,4-dihydro-3-quinolinecarboxylic acid and then the suspension is warmed to 70° C., after which 45 mg of methanesulfonic acid is added to the warmed suspension to form a uniform solution. Subsequently, the solution is stirred at the same temperature for 1 hour and then cooled to room temperature, after which the crystals deposited are collected by filtration to obtain 0.20 g of (R)-1-cyclopropyl-8-difluoromethoxy-7-(1-methyl-2,3-dihydro-1H-5-isoindolyl)-4-oxo-1,4-dihydro-3-quinolinecarboxylic acid methanesulfonate.

Provenance & Evidence